Sounds like you are into the engine, but did you check plugs and wires. I had a period of time that every time I got on the gas hard, it would start to vibrate. I was shaking loose the number 7 plug wire off the plug. How about connections on distributor cap?

One of the worst vibrations I ever had was with a b&m flexplate, almost shook my teeth out. Took it out, gave it away & got a mopar Sfi flexplate. Haven't had a problem since. Dave ss/ea #1355

Well I think I found my problem, dropped the tranny drained the fluid which is pretty decently new, it looks like very silverish metallic red paint , and not just a little bit either it's full of silvery very very fine metallic particles. I'm geussibg my convertor is toast

what brand is it?

Tci street fighter 3000-3500 stall but in my build its more like 3800 stall, least that's what I flash it to